Telegraph-receiver.



PATEN'TE-D APR. 26, 1904.

A L. GEREBOTANI. TELEGRAPH RECEIVER.

APPLICATION FILED an a. 1900.

N0 MODEL.

m: NDRRIS Pains to; PHOTO-LITHO. WASHINGTON. a. c..

- UNITED. STATES Patented April 26, 1904.

PATENT OFFICE.

LUIGI CEREBOIANI, OF MUNIOH, GERMANY, ASSIGNOR OF ONE-HALF TO ALBERT SILBERMANN, OF BERLIN, GERMANY.

TELEGRAPH-RECEIVER.

SPECIFICATION forming part of Letters Patent No. 758,202, dated April 26, 1904.

Application filed May 2, 1900. Slerial No. 15,251. (No model.)

. To all whom it may concern.-

' strument is designed to meet this requirement.

It consists of an exceedingly sensitive arrangement of electromagnets with pivoted armature of light material. On the end of the latter an opaque plate or disk is arranged, which when in a position of rest separates from each other the two apertures lying one above the other. One of these apertures is located in the top of a dark chamber and the other in the bottom of an exposing-chamber. In the dark chamber a sensitized band is provided, rolled in well-known manner, while in the exposing-chamber between a concave mirror and a double convex lens a source of light is arranged exactly above the two apertures, respectively located in the lid of the dark chamber and in the bottom of the exposingchamber. The action of the apparatus is such that on the electromagnetic arrangement responding to the current impulses the armature-plate which covers the two apertures is displaced laterally for a longer or shorter period, whereby the Morse characters appear on the sensitized band.

The new apparatus is shown on the accompanying drawings.

Figure 1 is a vertical section of the apparatus; Fig. 2-, a horizontal section of the parts above the dark chamber, taken on the line as w, Fig. 1. y 7

The extremely-sensitive electromagnetic arrangement may consist of two electromagnet ance in any position when no power is exerted upon it. The four electromagnets a a 6 b are traversed by the line-current and the magnets a a also traversed by a local current. At one end of the armature c, pivoted at d, an opaque plate f is arranged in such manner that it lies between two apertures a i. Of these the one, i, is in the lid of the dark chamber A and the other, 6, in the base of the exposing-chamber B.

In the dark chamber A is a sensitized band I) on a roller E, passing over guide-rolls F F below the aperture 2 In the exposing-chamber B above the aperture a is a condensinglens 0, the source of light 1), and a concave mirror 8, the source of light lying between mirror and lens. As long as the armature re mains at rest it covers the apertures Q; 2". When, however, a current impulse arrives from the line, it will be attracted by the electromagnets b b and expose the two apertures i c". The rays of light will now pass through the apertures and strike the sensitized band D, which is guided along, passing through the focus of the lens 0. Dashes or points of light will thus be produced on the band according as the armature c is attracted for a longer or shorter interval by the electromagnet Zw 6.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

A telegraphic receiver, comprising in com-- bination, a chamber containing a source of light and a condensing-lens and provided with an exposingaperture, a dark chamber provided with a corresponding aperture located below the said first aperture and containing a sensitized band traveling below said latter aperture through the focus of said lens, and electromagnet pairs having a common pivoted armature responding to the line-current im- In testimony whereof 1 have signed this pulses, which armature when at rest separates specification in the presence of two subscriband covers salcl apertures, and when operated mg wltnesses.

uncovers the same, whereupon the rays from LUIGI GEREBOTANI. 5 the source of light act upon the sensitized band Witnesses:

at intervals producing Morse signs, all sub- MARIE NAGENRANFT,

stantially as described V FLORENCE T. MCDONALD. v 

